Joe Jonas and Gigi Hadid Cuddle Up at Kylie Jenner's Birthday Party

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The Kardashians weren't the only ones celebrating Kylie Jenner's 18th birthday at Bootsy Bellows nightclub in Los Angeles on Sunday. The youngest member of the Kardashian-Jenner clan was also surrounded by many of her famous pals.

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A slew of young Hollywood's A-list came to party with the Keeping Up With the Kardashian's star as she entered adulthood (though her actual birthday was today). Naturally, Kylie's BFF, singer Pia Mia, was there, along with both Hadid sisters, Gigi and Bella, but she was also joined by Joe Jonas, Chuck Liddell, Sofia Richie, Hailey Baldwin and Nina Dorbev.

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WATCH: Kylie Jenner Turns 18 at Club, Gets a $320K Ferrari From Tyga

Even newly single Zayn Malik made an appearance, turning up around midnight to say hello to the birthday girl.

Kylie was clearly the center of attention, especially after being gifted a $320,000 Ferrari from rumored boyfriend Tyga, which she looked genuinely excited and shocked to receive.

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Kylie's pals, Gigi and Joe, were also pretty hard to miss. A partygoer said the two were cuddled up at a table all night and Joe couldn’t keep his eyes off his lovely lady. They also weren't camera shy at the soiree, with Gigi -- who nearly had a wardrobe malfunction in a low-cut slate-hued spaghetti strap dress -- hamming it up for a party photo with a fishy face as she threw her arm around Joe.

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The fairly new couple, who've already posted photos of each other on Instagram and taken a day trip to Disneyland, haven't wasted any time moving their relationship forward. In fact, the day after Kylie's party, the two were spotted getting cozy as they visited a pet adoption center in Los Angeles. They were giggling as they walked down the street Monday afternoon with their arms wrapped around the others' shoulders, and Gigi even gave Joe an Eskimo kiss (well, a side-cheek version).

Joe and Gigi are clearly still going strong, but we'd probably look that happy if we spent all night at Kylie's massive bash too.

Watch the video below to go inside the youngest Jenner's hot Hollywood night out.

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